Save/load state compiling, not tested
Xcode spoor failed linkage
Don’t serialize Universe context

I don’t think it does any good, since the execution stack won’t be the same after loading.
Making this a separate commit in case I change my mind later.
Return Context to std::stack

A stack can’t be iterated like a deque, but it’s not necessary now that Context isn’t serialized.
Handle the no-argument case as request for help

I can imagine this starting the REPL, in the future, but catch it this way for now.
Lay foundation of REPL
Nice first cut at a REPL

Already feels downright useful!
Show both value and, when present, string conversion

All I want next is tecla.
Clean up load/save state

Return true/false from the methods on system.
Improve In/OutFileStorage handling of streams. The implicit ‘bool’ conversion wasn’t working (don’t know why), and it wasn’t explicitly binary.
Have the REPL continue with the token stream until an error

Allows the interactive use of semicolons.
Still not doing multi-line output, and I may never. It’s just for debugging.
Sometimes the young guy’s right!

Added test cases to hammer down the edge cases.
Also found that my “inline” duplicates (make_expr_from_str, etc.) were confusing the debugger; consolidated.
Can read and run simple programs, sending ‘START’ to main

Not running ‘animal.ach’ correctly, due to some subtlety about object references, which bothers me.
Clean up the object name/ID confusion
Can run animal.ach now

Still needs unit tests to capture the cases it needed to be right: correct LHS/RHS handling, only identifier on RHS of OP_DOT
Also: newlines on the end of ‘read’ values are causing problems for animal.ach, but depended on by REPL. Need EOF inspector.
Resolve the EOF problem

Now a blank string means only a blank string.
Serialization class to 'archetype' folder
Xcode follow new location of Serialization